Connection methods and systems

ABSTRACT

Various novel connectors are provided. In one embodiment, the connector includes a collar configured to receive first and second components. In this embodiment, the connector may also include a load ring configured to be received in a groove of the second component and to move into and out of engagement with the collar when the second component is received by the collar. The connector of this illustrative embodiment may also include a cotter configured for installation to the second component and to inhibit disengagement of the load ring from the collar. In some embodiments, engagement of the load ring and the collar effects securing of the first and second components to one another. Other devices, systems, and methods related to connectors are also disclosed.

CROSS REFERENCE TO RELATED APPLICATIONS

This application claims priority to and benefit of U.S. Non-Provisionalapplication Ser. No. 13/707,574, entitled “Connection Methods andSystems,” filed Dec. 6, 2012, which is herein incorporated by referencein its entirety, and which claims priority to and benefit of U.S.Non-Provisional application Ser. No. 12/746,922, entitled “ConnectionMethods and Systems,” filed Jun. 8, 2010, which is herein incorporatedby reference in its entirety, and which claims priority to and benefitof PCT Patent Application No. PCT/US2009/030489, entitled “ConnectionMethods and Systems,” filed Jan. 8, 2009, which is herein incorporatedby reference in its entirety, and which claims priority to and benefitof U.S. Provisional Patent Application No. 61/022,622, entitled“Connection Methods and Systems”, filed on Jan. 22, 2008, which isherein incorporated by reference in its entirety.

FIELD OF THE INVENTION

The present invention relates generally to connection systems forvarious components, such as fluid conduits. More particularly, thepresent invention relates to various novel connectors for coupling apair of components together in an end-to-end relationship.

BACKGROUND

This section is intended to introduce the reader to various aspects ofart that may be related to various aspects of the present invention,which are described and/or claimed below. This discussion is believed tobe helpful in providing the reader with background information tofacilitate a better understanding of the various aspects of the presentinvention. Accordingly, it should be understood that these statementsare to be read in this light, and not as admissions of prior art.

As will be appreciated, oil and natural gas have a profound effect onmodern economies and societies. Indeed, devices and systems that dependon oil and natural gas are ubiquitous. For instance, oil and natural gasare used for fuel in a wide variety of vehicles, such as cars,airplanes, boats, and the like. Further, oil and natural gas arefrequently used to heat homes during winter, to generate electricity,and to manufacture an astonishing array of everyday products.

In order to meet the demand for such natural resources, numerouscompanies invest significant amounts of time and money in searching forand extracting oil, natural gas, and other subterranean resources fromthe earth. Particularly, once a desired resource is discovered below thesurface of the earth, drilling and production systems are often employedto access and extract the resource. These systems may be located onshoreor offshore depending on the location of a desired resource. Further,such systems generally include a wellhead assembly through which theresource is extracted. These wellhead assemblies may include a widevariety of components and/or conduits, such as various casings, valves,and the like, that control drilling and/or extraction operations.Additionally, various production and transport systems may also employpipes or other fluid conduits, in addition to the components notedabove.

As will be appreciated, various fluid conduits or other components of aproduction or transport system are typically coupled to one another toenable oil, gas, or the like to be extracted from the ground and routedto a desired location. Such fluid conduits (or “tubular members”) areoften coupled together in end-to-end relationships via variousconnectors that facilitate flow of oil, gas, or the like between theconduits. In some instances, these connectors may be subjected to largeaxial loads, such as gravity (particularly in the case of suspendedconduits) or internal pressures within the conduits. Also, it will beappreciated that the space available for connecting conduit members maybe limited in some applications. Consequently, there is a need fordurable connectors that, among other things, have low profiles, providesealed connections between two components (e.g., fluid conduits), andcan withstand the axial loads expected within a given system.

SUMMARY

Certain aspects commensurate in scope with the originally claimedinvention are set forth below. It should be understood that theseaspects are presented merely to provide the reader with a brief summaryof certain forms the invention might take and that these aspects are notintended to limit the scope of the invention. Indeed, the invention mayencompass a variety of aspects that may not be set forth below.

Embodiments of the present invention generally relate to novelconnectors for joining two components, such as tubular members orconduits. In some exemplary embodiments, the exemplary connectorincludes a collar configured to receive each of the two components in anend-to-end arrangement. In one embodiment, the collar is configured tobe threaded onto a first of the two components and to be coupled to thesecond of the two components via a load ring disposed between the collarand the second component. In such an embodiment, a locking key or cottermay be installed to facilitate positive engagement of the load ring withthe collar.

In other embodiments, load rings may be provided in grooves of both ofthe two components to facilitate locking of the components to oneanother. In one embodiment, one or more anti-rotation rods may beinstalled, either permanently or temporarily, in either or both of thegrooves to prevent rotation of the load rings during engagement by acollar. In various embodiments, the load rings may comprise C-rings,segmented rings, other split rings, or the like. Additionally, invarious embodiments, rotation of the collar effects axial movement ofone or both of the load rings to secure the two components to oneanother.

Various refinements of the features noted above may exist in relation tovarious aspects of the present invention. Further features may also beincorporated in these various aspects as well. These refinements andadditional features may exist individually or in any combination. Forinstance, various features discussed below in relation to one or more ofthe illustrated embodiments may be incorporated into any of theabove-described aspects of the present invention alone or in anycombination. Again, the brief summary presented above is intended onlyto familiarize the reader with certain aspects and contexts of thepresent invention without limitation to the claimed subject matter.

BRIEF DESCRIPTION OF THE DRAWINGS

These and other features, aspects, and advantages of the presentinvention will become better understood when the following detaileddescription is read with reference to the accompanying drawings in whichlike characters represent like parts throughout the drawings, wherein:

FIG. 1 is a front elevational view of a system including two connectionmembers coupled to one another via a collar in accordance with oneembodiment of the present invention;

FIG. 2 is an exploded cross-sectional view of the system of FIG. 1,illustrating various features of the exemplary system, including a loadring disposed in a groove of one of the connection members, inaccordance with one embodiment of the present invention;

FIG. 3 is a perspective view of an exemplary load ring in accordancewith one embodiment of the present invention;

FIG. 4 illustrates an exemplary toothed surface of the load ring of FIG.3 that may be provided in accordance with certain embodiments of thepresent invention;

FIG. 5 illustrates a different exemplary toothed surface of the loadring of FIG. 3 in accordance with certain embodiments of the presentinvention;

FIG. 6 is a cross-sectional view of the system of FIG. 2, illustratingthe stabbing of one connection member to the other connection member andthe movement of the load ring into an additional groove in accordancewith one embodiment of the present invention;

FIG. 7 is a cross-sectional view of the system of FIG. 6, illustratingthe installation of a key through a window of the collar and within theadditional groove in accordance with one embodiment of the presentinvention;

FIG. 8 is a partial detail view generally taken along line 8-8 of FIG.7, illustrating the key secured to the connection member with a pair ofset screws and portions of the load ring accessible through the windowof the collar in accordance with one embodiment of the presentinvention;

FIG. 9 is a cross-sectional view of the system of FIG. 7, illustratingthe rotation of the collar to draw the load ring away from the installedkey and into the upper groove of the connection member in accordancewith one embodiment of the present invention;

FIG. 10 is a partial detail view generally taken along line 10-10 ofFIG. 9, illustrating the relative positions of the load ring and theinstalled key through the window of the collar in accordance with oneembodiment of the present invention;

FIG. 11 is a cross-sectional view of the system of FIG. 9, illustratingthe securing of the load ring within the additional groove, followingthe removal of the key and rotation of the collar, to facilitatedisconnection of the two connection members in accordance with oneembodiment of the present invention;

FIG. 12 is a partial detail view generally taken along line 12-12 ofFIG. 11, illustrating the fastening of the load ring to the connectionmember via a pair of set screws in accordance with one embodiment of thepresent invention;

FIG. 13 is a cross-sectional view of the system of FIG. 11, illustratingthe removal of the connection members from one another in accordancewith one embodiment of the present invention;

FIG. 14 is a front elevational view of a system including two connectionmembers coupled to one another via a collar in accordance with certainembodiments of the present invention;

FIG. 15 is a cross-sectional view of one of the connection members ofFIG. 14, including a load ring disposed in a groove of the connectionmember and an anti-rotation rod that inhibits rotation of the load ringwithin the groove in accordance with one embodiment of the presentinvention;

FIG. 16 is a cross-sectional view of the connection member of FIG. 15following the coupling of a collar to the load ring and removal of theanti-rotation rod in accordance with one embodiment of the presentinvention;

FIG. 17 is a cross-sectional view of the system of FIG. 15, illustratingthe alignment of the connection member illustrated in FIG. 16 to anadditional connection member having a load ring disposed in a groove andan anti-rotation rod, and illustrating the initial engagement of thecollar with the load ring of the additional connection member inaccordance with one embodiment of the present invention;

FIG. 18 is a cross-sectional view of the system of FIG. 17, illustratingthe threading of the collar onto the lower load ring to draw the upperand lower load rings toward one another in accordance with oneembodiment of the present invention;

FIG. 19 is a cross-sectional view of the system of FIG. 18, illustratingfurther rotation of the collar to secure the connection members to oneanother via the two load rings in accordance with one embodiment of thepresent invention;

FIG. 20 is a cross-sectional view of the system of FIG. 19, in which theviewing plane is offset about the axis of the system with respect to theviewing plane of FIG. 19, illustrating alignment pins that may beprovided in accordance with one embodiment of the present invention;

FIG. 21 is an exploded cross-sectional view of another exemplaryconnection system in accordance with one embodiment of the presentinvention;

FIG. 22 is a cross-sectional view of the system of FIG. 21, illustratingthe alignment of the two connection members to one another in accordancewith one embodiment of the present invention;

FIG. 23 is a cross-sectional view of the system of FIG. 22, illustratingmovement of the collar to engage a load ring in a lower connectionmember and a plurality of ring segments in an upper connection member inaccordance with one embodiment of the present invention; and

FIG. 24 is a cross-sectional view of the system of FIG. 23, illustratingthe securing of the two connection members to one another via the loadring, the collar, and the plurality of ring segments in accordance withone embodiment of the present invention.

DETAILED DESCRIPTION OF SPECIFIC EMBODIMENTS

One or more specific embodiments of the present invention will bedescribed below. In an effort to provide a concise description of theseembodiments, all features of an actual implementation may not bedescribed in the specification. It should be appreciated that in thedevelopment of any such actual implementation, as in any engineering ordesign project, numerous implementation-specific decisions must be madeto achieve the developers' specific goals, such as compliance withsystem-related and business-related constraints, which may vary from oneimplementation to another. Moreover, it should be appreciated that sucha development effort might be complex and time consuming, but wouldnevertheless be a routine undertaking of design, fabrication, andmanufacture for those of ordinary skill having the benefit of thisdisclosure.

When introducing elements of various embodiments of the presentinvention, the articles “a,” “an,” “the,” and “said” are intended tomean that there are one or more of the elements. The terms “comprising,”“including,” and “having” are intended to be inclusive and mean thatthere may be additional elements other than the listed elements.Moreover, the use of “top,” “bottom,” “above,” “below,” and variationsof these terms is made for convenience, but does not require anyparticular orientation of the components.

Turning now to the present figures, an exemplary system 10 including astab-type connector is illustrated in FIGS. 1 and 2 in accordance withone embodiment of the present invention. The exemplary system 10includes a pair of connection members configured to be coupled to oneanother, such as a pin member or component 12 coupled to a box member orcomponent 14. In one embodiment, the connector of the system 10 includesa union ring or collar 16 configured to cooperate with a load ring 50and a locking key or cotter 60 to secure the pin member 12 to the boxmember 14, as discussed in greater detail below. While certaincomponents may be referred to herein as pin members or box members, itshould be noted that such references are provided for the sake ofclarity, and that such components (or features thereof) may be reversedin accordance with certain embodiments. For instance, in one embodiment,the members 12 and 14 could instead be configured as a box member and apin member, respectively, in full accordance with the presenttechniques.

Either or both of the pin member 12 and the box member 14 may includevarious mounting features 18, such as recesses, to facilitate couplingof such members to one or more additional components. In someembodiments, the pin and box members 12 and 14 are configured to enablecoupling of various tubular members to one another. For example, each ofthe pin member 12 and the box member 14 may be coupled to a respectivepipe via recesses or some other mounting features 18, allowing the twopipes to be secured to one another via the connector. Similarly, the pinand box members 12 and 14 could also be used to couple various othercomponents together, such as a pipe to a wellhead component, a firstwellhead component to a second wellhead component (e.g., in a stackedwellhead arrangement), or the like.

While the mounting features 18 in the presently illustrated embodimentinclude recesses configured to receive a fastener, it will beappreciated that the pin and box members 12 and 14 may be coupled totheir respective components in any suitable fashion, including throughthreaded connections, studs, flanges, clamps, welding, or other mountingtechniques. Indeed, in some embodiments, one or both of the pin and boxmembers 12 and 14 may be provided as an integral part of such respectivecomponents. For instance, in one embodiment, the pin member 12 isintegrally formed as a portion of a wellhead and the box member 14 iscoupled to or integral with a production tree (e.g., a “Christmas tree”)or other wellhead component to be mounted on the wellhead. While certainembodiments may be described in an oil or gas (or other resource)production context, it should be noted that the presently-disclosedconnection system may also be used to couple components unrelated to oilor gas production in full accordance with the present techniques.

In the presently illustrated embodiment, the box member 14 includes abore 22 and the pin member 12 includes a bore 20. Various additionalcomponents may be received within either or both of the bores 20 and 22.For example, in one embodiment, various additional components 24, suchas hangers, pipes, tubing, wellhead members, other fluid conduits, orthe like may be received within the bores 20 and/or 22 of the box member14 and the pin member 12. In the presently illustrated embodiment, thecomponents 24 include a hanger and a fluid conduit that are securedwithin the bore 20 via locking rings 26, though other securing means arealso envisaged. In one embodiment, the internal fluid conduit includes abore 28, which is generally aligned with the bore 22 when the pin andbox members 12 and 14 are connected to one another. Various seals 30and/or seal rings 32 may be provided throughout the system to inhibitfluid leakage from the various bores of the system 10.

In one embodiment, to facilitate coupling of the pin member 12 and thebox member 14, the collar 16 is threaded onto the box member 14 viamating threaded surfaces 34 and 36. The collar 16 may also includerecesses 38, which are configured to receive set screws that preventfurther rotation of the collar 16 with respect to the box member 14. Theexemplary collar 16 is configured to receive an end 44 of the pin member12, in addition to a portion of the box member 14, such that the pinmember 12 and the box member 14 may be secured to one another in anend-to-end arrangement. Notably, in the presently illustratedembodiment, the collar 16 also includes an aperture or window 40 thatfacilitates user access to the load ring 50 and installation of the key60 to secure the pin and box members 12 and 14 to one another, asdiscussed in further detail below.

To facilitate locking of the pin and box members 12 and 14 together, thepin member 12 of one embodiment includes grooves 46 and 48 for receivinga load ring 50 and a locking key 60 (FIG. 7). The load ring 50, asdepicted in FIG. 3 in accordance with one embodiment of the presentinvention, is configured to engage the collar 16 when the pin member 12(and at least a portion the groove 46 and/or 48 containing the load ring50) is inserted into the collar 16. In some embodiments, the load ring50 includes a grooved surface, such as a number of teeth or threads 52configured to engage a plurality of complimentary teeth or threads 54provided on an inner surface of the collar 16. Such teeth 52 and 54 maybe provided in various configurations, such as helical or other threads,rectangular teeth or angled teeth (as generally depicted in FIGS. 4 and5, respectively), or the like. In some embodiments, the load ring 50 maybe a split ring, such as a C-ring. Additionally, in one embodiment, theload ring 50 includes apertures 56 adjacent circumferential ends 58(defined by a split in the load ring 50) that facilitate securing of theload ring 50 to the pin member 12 as discussed in greater detail below.

The load ring 50 may initially be positioned within the groove 46, asillustrated in FIG. 2. In one embodiment, when the pin and box members12 and 14 are initially joined or “stabbed” to one another, the teeth orthreads 54 of the collar 16 engage the mating surface of the load ring50 and guide the load ring 50 from the upper groove 46 to the lowergroove 48, as generally depicted in FIG. 6. Once the load ring 50 ismoved into the groove 48, a locking key or cotter 60 may be installedthrough the window 40 of the collar 16 and secured to the pin member 12between opposing ends 58 of the load ring 50, as generally illustratedin FIGS. 7 and 8. It will be appreciated that, while the exemplarywindow 40 of FIG. 8 is presently illustrated as a generally rectangularwindow, other configurations (e.g., elliptical, circular, or the like)may also be employed. In one embodiment, the key 60 is secured withinthe groove 48 via one or more set screws 62 inserted through respectiveapertures 64 of the key 60 and into threaded recesses 66 of the pinmember 12. The key 60 may have a toothed and/or threaded outer surface,although a key 60 having some other outer surface contour may instead beemployed in full accordance with the present techniques. The key 60facilitates positive engagement of the load ring 50 with the collar 16,and generally prevents the collar 16 from contracting within the groove48.

In some embodiments, following installation of the key 60 within thegroove 48, the collar 16 may be rotated on the threads 34 of the boxmember 14 such that the load ring 50 is drawn from the groove 48 intothe groove 46 and axial clearance, or “slack,” in the connection betweenthe pin member 12 and the box member 14 is removed, as generallydepicted in FIGS. 9 and 10. Further, once such slack is removed, thecollar 16 may be further rotated to preload the connection between thepin member 12 and the box member 14. In some embodiments, the groove 46is sized such that positive engagement of the load ring 50 to the collar16 is maintained not only by the installed key 60, but also by thegroove itself. Also, in at least one embodiment, the rotation of thecollar 16 on the threads 34 is the only rotation needed in the system 10to couple the pin member 12 to the box member 14. A cover plate (notshown) may be provided over or within the window 40 to protect theconnection between the collar 16 and the load ring 50.

It should be noted that, in the presently illustrated embodiment, thecollar 16, the load ring 50 and the locking key 60 are members of alow-profile, or slender, connector suitable for use in an array ofconnection applications, including those that may provide a limitedamount of space for connecting various members, such as in certainconductor-sharing, split-compact, and/or stacked wellheads. Further, itwill be appreciated that the present system 10 allows for simpleinstallation and coupling of two tubular members or components.Additionally, the pin and box members 12 and 14 may also be disconnectedfrom one another in a simple and convenient fashion, as discussed below.

For instance, an exemplary manner of uncoupling the pin member 12 fromthe box member 14 is generally illustrated in FIGS. 11-13. In someembodiments, the pin and box members 12 and 14 may be disengaged byremoving the key 60 from the groove 48 via the window 40, rotating thecollar 16 to guide the load ring 50 from the groove 46 to the groove 48,and securing the load ring 50 to the pin member 12 via the set screws62. For example, in one embodiment, the set screws 62 are removed fromthe key 60 (allowing the key 60 to be removed from the assembly throughthe window 40), and the set screws 62 are then inserted through theapertures 56 of the load ring 50 and into the recesses 66 to disengagethe teeth or threads 52 from the mating teeth or threads 54 of thecollar 16. In one embodiment, a C-clamp may be employed, such as inconjunction with a pair of mandrels temporarily inserted in theapertures 56, to facilitate disengagement of the load ring 50 from thecollar 16, alignment of the apertures 58 with the recesses 66, andsecuring of the load ring 50 to the pin member 12 via the set screws 62.Depending on the relative size of the window 40 and the area to which itprovides access, the key 60 may be removed prior to or followingmovement of the load ring 50 (via rotation of the collar 16) out of thegroove 46 and into the groove 48. The box member 14 may then be pulledapart from the pin member 12, as generally represented by the arrow 68in FIG. 13.

An exemplary connection system 80 is generally illustrated in FIGS.14-20 in accordance with another embodiment of the present invention.The exemplary system 80 includes a pin member or component 82 that isconfigured to be coupled to a box member or component 84 via a collar 86and load rings 96 and 126, as discussed in greater detail below. The pinmember 82 and the box member 84 may include respective flanges 88 and 90to facilitate coupling of the members to other components, such as apipe, a wellhead component, or the like. It will be appreciated that, asdiscussed above with respect to exemplary system 10, the pin and boxmembers 82 and 84 may be coupled to other respective components in anysuitable fashion, with or without flanges 88 and 90, or may be providedas an integral part of such respective components. In one embodiment,the system 80 may be employed to couple a production tree to a wellhead,although other applications are also envisaged.

Additional details of the exemplary system 80, as well as an exemplarymethod for coupling the pin and box members 82 and 84 to one another,may be better understood with reference to FIGS. 15-20. In theembodiment illustrated in FIG. 15, the box member 84 includes aplurality of mounting holes 92 in the flange 90 to facilitationattachment of the box member 84 to some other component, such as aproduction tree. The box member 84 also includes a bore 94. Although thebore 94 is illustrated as a generally straight bore for the sake ofclarity, it should be noted that additional components may be installedwithin the bore 94, and that the bore 94 may have some otherconfiguration, such as one similar or identical to the box member 14(FIG. 2), for example.

In one embodiment, a load ring 96 is disposed within a circumferentialgroove 98 in a surface of the box member 84. In some embodiments, theload ring 96 is a split load ring, such as a C-ring. In suchembodiments, an anti-rotation rod or pin 100 may be inserted through anaperture 102 of the box member 84 and a split in the load ring 96, andinto a recess 104 of the box member 84. In one embodiment, an end 106 ofthe anti-rotation rod 100 includes a threaded outer surface configuredto engage a complimentary surface in the recess 102 to secure theanti-rotation rod 100 within the box member 84. It may be appreciatedthat installation of the anti-rotation rod 100 in the box member 84 andbetween corresponding end portions of the load ring 96 generallyprevents rotation of the load ring 96 within the groove 98.

Once the load ring 96 and the anti-rotation rod 100 are installed in thebox member 84, the collar 86 (which includes grooved, threaded, ortoothed surfaces 108 and 110) may be coupled to the box member 84 viathe load ring 96. For instance, in one embodiment, the anti-rotation rod100 generally prevents rotation of the load ring 96 while the collar 86is threaded onto the load ring 96 via complimentary threaded surfaces108 and 112. Further, in some embodiments, the collar 86 may be securedto the load ring 96 in some additional or alternative manner, such asthrough the use of set screws 114. Such set screws may be provided atone or more various points along the circumference of the collar 86.Once the collar 86 is secured to the load ring 96, the anti-rotation rod100 may be removed from the box member 84, such as generally illustratedin FIG. 16. It should be noted that, upon removal of the anti-rotationrod 100, the load ring 96 is free to rotate within the groove 98,allowing complimentary rotation of the collar 86 about an end of the boxmember 84 without relative movement between the collar 86 and the loadring 96.

The box member 84 and the collar 86 may then be aligned over the pinmember 82, as generally illustrated in FIG. 17. Similar to the flange 90of the box member 84, a plurality of mounting holes 122 may be providedin the flange 88 to facilitate coupling of the pin member 82 to othercomponents, such as a wellhead component. While the pin member 82 ispresently illustrated with a generally straight bore 124, it will beappreciated that the bore 124 may have other configurations in differentembodiments, and that various components, such as hangers, tubing, orthe like may be installed within the bore 124, as similarly discussedabove with respect to the bore 20 of the exemplary system 10.Additionally, various components installed within the bore 124 mayprovide a plurality of separate bores for fluid conveyance. Seals 30and/or seal rings 32 may be included at various locations in the systemto inhibit fluid leakage from the bores of the system 80.

In the presently illustrated embodiment, the pin member 82 includes aload ring 126 disposed within a circumferential groove 128. Further, inone embodiment, the load ring 126 includes at least one split, such asin a C-ring or a multi-piece ring. An anti-rotation rod or pin 130 isinstalled through an aperture 132, the groove 128, and a split in thering 126, and into a recess 134 of the pin member 82. The anti-rotationrod 130 may also include a threaded portion 136 configured to mate witha complimentary surface of the aperture 132 to secure the anti-rotationrod 130 within the pin member 82. In some embodiments, the anti-rotationrod 130 may be substantially similar to the anti-rotation rod 100.Indeed, in one embodiment, the anti-rotation rod 100 may be removed fromthe box member 84, as discussed above, and installed in place of theanti-rotation rod 130 within the pin member 82.

Once the pin and box members 82 and 84 are aligned, the collar 86 may berotated such that the threaded surface 110 of the collar 86 engages acomplimentary threaded surface 138 of the load ring 126, as generallyillustrated in FIG. 18. Notably, the anti-rotation rod 130 inhibitsrotation of the load ring 126, causing rotation of the collar 86 in afirst direction to induce axial movement of the load ring 126 within thegroove 128 toward the load ring 96. Continued rotation of the collar 86in the same direction removes slack from the connection and secures thepin member 82 and the box member 84 to one another, as generallyillustrated in FIG. 19. It should be noted that the collar 86 may bestill further rotated in the same direction to preload the connection.

In one embodiment, alignment pins 142 may be provided and configured tocooperate with respective recesses 144 and 146 to facilitate alignmentof the pin and box members 82 and 84 during an exemplary couplingprocess, as generally illustrated in FIG. 20. It should be noted that,as presently illustrated, such alignment pins 142 may be provided atdifferent circumferential locations than the installation points for theanti-rotation rods 100 and 130. Further, it will be appreciated that, inother embodiments, such alignment pins 142 may be formed integrally witheither or both of the pin and box members 82 and 84. Disconnection ofthe pin and box members 82 and 84 may be effected through rotation ofthe collar 86 (in a second direction opposite that discussed above),causing the load rings 96 and 126 to move away from one another and thecollar 86 to disconnect from the load ring 126, thus allowing the pinand box members 82 and 84 to be pulled apart from one another.

An exemplary connection system 160 is generally illustrated in FIGS.21-24 in accordance with an additional embodiment of the presentinvention. The exemplary system 160 includes a pin member or component162 and a box member or component 164 configured to be coupled to oneanother by way of a collar 166 and load rings 180 and 190, as discussedin greater detail below. The pin and box members 162 and 164 may beconfigured to be mounted to additional components or devices, such aswellhead components, production trees, pipes, other conduits, or thelike. In one embodiment, the pin and box members include flanges 168 and172 having respective mounting holes 170 and 174. From the abovediscussion, however, it will be appreciated that the pin and box members162 and 164 may be coupled to other respective components in anysuitable fashion, or may be provided as an integral part of suchrespective components. In one embodiment, the system 160 may be employedto couple a production tree to a wellhead, although the system may beemployed to couple a variety of other components to one another.Additionally, although illustrated with generally-straight bores, itwill be appreciated that the pin and box members 162 and 164 may includea variety of bore configurations, and may be adapted to receive variousadditional components, as discussed above with respect to otherembodiments. Further, seals 30 and/or seal rings 32 may be providedthroughout the system to inhibit fluid leakage from the various bores ofthe system 160.

In one embodiment, a load ring 180 is disposed within a groove 182 ofthe box member 164. In some embodiments, the load ring 180 is a splitload ring, such as a C-ring or, as depicted in the presently illustratedembodiment, a segmented load ring having a plurality of ring segments.In the case of the latter, a snap ring 183 may be provided to facilitatealignment of the various ring segments of the load ring 180 within thegroove 182. The collar 166 may be fitted over an end of the box member164 and the load ring 180, and then secured to the box member 164. Inone embodiment, the collar 166 is secured directly to the body of thebox member 164 via one or more set screws 184 inserted throughrespective apertures 186. In other embodiments, the collar 166 can becoupled to the box member 164 via other suitable techniques, includingthrough connections formed with the load ring 180.

In some embodiments, the pin member 162 also includes a load ring 190disposed within a groove 192. Further, in the presently illustratedembodiment, the load ring 190 includes a ring having at least one split,such as a C-ring or a multi-piece ring. An anti-rotation rod or pin 194may be inserted through an aperture 196 and the split in the load ring190, and received in a recess 198 of the pin member 162. Theanti-rotation rod 194 may also include a threaded portion 200 configuredto mate with a complimentary surface of the aperture 196 to secure theanti-rotation rod 194 within the pin member 162. As similarly discussedabove, the anti-rotation rod 194 generally prevents rotation of the loadring 190 within the groove 192.

Subsequently, the box member 164 may be placed in axial alignment overthe pin member 162 and the set screws 184 may be loosened such that thecollar 166 is positioned against the load ring 190 and is free to movewith respect to the box member 164, as generally illustrated in FIG. 22.The collar 166 may be moved to couple the collar 166 to the load ring190. For example, in one embodiment, the collar 166 is moved downwardlytoward the load ring 190 and rotated to thread the collar 166 onto theload ring 190 via mating grooved or threaded surfaces 204 and 206. Asnoted above, the anti-rotation rod 194 generally prevents rotation ofthe load ring 190 with the collar 166, causing the load ring 190 to bedrawn into the collar 166 and toward the load ring 180 upon rotation ofthe collar in a first direction.

Additionally, a grooved portion 208 of the collar 166 may be configuredto mate with one or more complimentary surfaces 210 of the load ring180. In one embodiment, various ring segments of the load ring 180 slidedown a tapered portion 212 of the groove 182, facilitating positiveengagement between the ring segments and the grooved portion 208 of thecollar 166, as generally illustrated in FIGS. 22 and 23. As a result ofthe mating engagement of the collar 166 with both load rings 180 and190, continued rotation of the collar 166 draws the load rings 180 and190 toward the sides of their respective grooves, removes slack from theconnection, and secures the pin and box members 162 and 164 together, asgenerally illustrated in FIG. 24. Further torque may be applied to thecollar to provide a preloaded connection of the pin member 162 to thebox member 164. The pin and box members 162 and 164 may be disconnectedby rotating the collar 166 in a second direction, opposite the first,until the collar 166 is free from the load ring 190. Once free, thecollar 166 may then be secured to the box member 164, such as via setscrews 184, and the pin and box members 162 and 164 may be pulled apartfrom one another.

It should be noted that certain embodiments of the present inventiongenerally include low-profile connectors suitable for use in an array ofconnection applications, including those that may provide a limitedamount of space for connecting various members, such as in certainconductor-sharing, split-compact, and/or stacked wellheads. Further, itwill be appreciated that various embodiments of such connection systemsmay generally provide high-strength connectors that facilitate quickcoupling and uncoupling of two tubular members or components.

While the invention may be susceptible to various modifications andalternative forms, specific embodiments have been shown by way ofexample in the drawings and have been described in detail herein.However, it should be understood that the invention is not intended tobe limited to the particular forms disclosed. Rather, the invention isto cover all modifications, equivalents, and alternatives falling withinthe spirit and scope of the invention as defined by the followingappended claims.

1. A system, comprising: a coupling, comprising: a collar comprisingfirst threads along a first end portion and second threads along asecond end portion; a first load ring having first mating threads; andat least one anti-rotation feature configured to guide the first loadring into a first threaded engagement with the collar, wherein the firstthreaded engagement comprises the first threads mated with the firstmating threads.
 2. The system of claim 1, wherein the at least oneanti-rotation feature comprises at least one rod, key, or snap ring. 3.The system of claim 1, wherein the first load ring comprises a firstsplit load ring.
 4. The system of claim 3, wherein the at least oneanti-rotation feature is disposed in a first split in the first splitload ring.
 5. The system of claim 4, wherein the at least oneanti-rotation feature comprises a rod.
 6. The system of claim 4, whereinthe at least one anti-rotation feature comprises a key having a fastenerreceptacle to receive a radial fastener.
 7. The system of claim 6,wherein the first split ring comprises a first fastener receptacledisposed in a first circumferential end portion and a second fastenerreceptacle disposed in a second circumferential end portion, the firstand second circumferential end portions are disposed about the firstsplit, and the first and second fastener receptacles are configured toreceive respective first and second radial fasteners.
 8. The system ofclaim 7, wherein the collar comprises a window selectively disposedabout the key, the first circumferential end portion, and the secondcircumferential end portion.
 9. The system of claim 1, wherein thecoupling comprises a second load ring having second mating threadsconfigured to selectively mate with the second threads of the collar ina second threaded engagement.
 10. The system of claim 9, wherein the atleast one anti-rotation feature is configured to guide the second loadring into the second threaded engagement with the collar.
 11. The systemof claim 10, wherein the at least one anti-rotation feature comprises acommon anti-rotation feature selectively used to guide the first loadring into the first threaded engagement with the collar or to guide thesecond load ring into the second threaded engagement with the collar.12. The system of claim 10, wherein the at least one anti-rotationfeature comprises a snap ring configured to guide the first load ringinto the first threaded engagement with the collar and a rod configuredto guide the second load ring into the second threaded engagement withthe collar.
 13. The system of claim 9, wherein the first load ring isdisposed along a first groove in a first component, and the second loadring is disposed along a second groove in a second component.
 14. Thesystem of claim 13, wherein the first groove comprises a tapered groove.15. The system of claim 13, wherein the collar is selectively fastenedto the first component with one or more fasteners after the first loadring and the collar are coupled together via the first threadedengagement.
 16. The system of claim 13, wherein the first load ringcouples the collar to the first component and the second load ringcouples the collar to the second component, wherein the first load ringand the collar are configured to rotate together to facilitate couplingof the second load ring and the collar via the second threadedengagement.
 17. The system of claim 1, wherein the first load ringcouples the collar to a first component, and the second threads couplethe collar to a second component.
 18. The system of claim 1, comprisingone or more mineral extraction components coupled together via thecoupling.
 19. A system, comprising: a coupling, comprising: a collarcomprising first threads along a first end portion and second threadsalong a second end portion; a first split load ring having a first splitbetween first opposite circumferential end portions of the first splitload ring; and a first anti-rotation feature configured to selectivelymount in the first split between the first opposite circumferential endportions of the first split load ring, wherein the first split load ringcomprises first mating threads configured to selectively engage with thefirst threads.
 20. The system of claim 19, comprising a second splitload ring having a second split between second opposite circumferentialend portions of the second split load ring, wherein the second splitload ring comprises second mating threads configured to selectivelyengage with the second threads.
 21. A system, comprising: a coupling,comprising: a collar comprising first threads along a first end portionand second threads along a second end portion; a split load ring havinga split between first and second circumferential end portions of thesplit load ring, wherein the first and second circumferential endportions comprise respective first and second fastener receptaclesconfigured to receive respective first and second radial fasteners,wherein the collar comprises a window selectively disposed about thefirst and second circumferential end portions.
 22. The system of claim21, comprising a key configured to selectively mount in the splitbetween the first and second circumferential end portions of the splitload ring.